netdev - Re: [PATCH v2 iproute2-next 3/6] rdma: Add CM

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Date:   Mon, 26 Mar 2018 12:13:53 -0500
From:   Steve Wise <swise@...ngridcomputing.com>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     David Ahern <dsahern@...il.com>, stephen@...workplumber.org,
        netdev@...r.kernel.org, linux-rdma@...r.kernel.org
Subject: Re: [PATCH v2 iproute2-next 3/6] rdma: Add CM_ID resource tracking
 information



On 3/26/2018 12:06 PM, Leon Romanovsky wrote:
> On Mon, Mar 26, 2018 at 10:24:25AM -0500, Steve Wise wrote:
>>
>> On 3/26/2018 10:08 AM, Leon Romanovsky wrote:
>>> On Mon, Mar 26, 2018 at 09:55:46AM -0500, Steve Wise wrote:
>>>> On 3/26/2018 9:44 AM, David Ahern wrote:
>>>>> On 3/26/18 8:30 AM, Steve Wise wrote:
>>>>>> On 3/26/2018 9:17 AM, David Ahern wrote:
>>>>>>> On 2/27/18 9:07 AM, Steve Wise wrote:
>>>>>>>> diff --git a/rdma/rdma.h b/rdma/rdma.h
>>>>>>>> index 5809f70..e55205b 100644
>>>>>>>> --- a/rdma/rdma.h
>>>>>>>> +++ b/rdma/rdma.h
>>>>>>>> @@ -18,10 +18,12 @@
>>>>>>>>  #include <libmnl/libmnl.h>
>>>>>>>>  #include <rdma/rdma_netlink.h>
>>>>>>>>  #include <time.h>
>>>>>>>> +#include <net/if_arp.h>
>>>>>>>>
>>>>>>>>  #include "list.h"
>>>>>>>>  #include "utils.h"
>>>>>>>>  #include "json_writer.h"
>>>>>>>> +#include <rdma/rdma_cma.h>
>>>>>>>>
>>>>>>> did you forget to add rdma_cma.h? I don't see that file in my repo.
>>>>>> It is provided by the rdma-core package, upon which rdma tool now
>>>>>> depends for the rdma_port_space enum.
>>>>>>
>>>>> You need to add a check for the package, and only build rdma if that
>>>>> package is installed. See check_mnl in configure for an example.
>>>> Ok, that makes sense.
>>> IMHO, better solution will be to copy those files to iproute2.
>> Hey Leon,
>>
>> Why is it better in your opinion?  My gut tells me adding rdma_cma.h to
>> iproute2 means more uabi type syncing.
> Making rdmatool be dependant on rdma-core will require that distributions
> will update their specs to install rdma-core as a dependency for every
> iprotue2 install.
>
> The rdma-core dependency makes sense for RDMA users, but doesn't for most of
> the iproute2 users.

I'm fuzzy on the details of distro packaging, but David's suggestion is
that rdmatool wouldn't get built if rdma-core isn't present. But
everything else would.  Just like it does not get built if libmnl is not
installed.  For pre-built rpms, the rdma-core would have to be present. 

I'm ok pulling it in, I'm just trying to understand. :)

Steve.